HD 7990

[GTX590]

I am very curious about this video card. The ones out there right now, the "unofficial ones" cost about 899.99, but they use a triple slot setup with 3 8-pin connectors. The actual AMD design calls for only 2 and a dual slot setup. If AMD releases this card at 799.99, I am temped to say that it could be worth the buy. It would slightly outperform an HD 7950 setup (as it's 2 HD 7970's @ 950/1350) and it doesn't have some of the draw backs as 2 cards. Which would be heat, power consumption, noise, and overall wait. I'd go to say that the performance should edge out slightly in favor compared to 2 HD 7970's standard (not GHz), as it doesn't use an actual bridge as well. I would sell my HD 7950 Vapor-X and buy one if it was 799.99, but clearly this is wishful thinking on my part. But the fact that the HD 7990 does and will outperform a 690 and titan for at least 100 if not 200 less is tempting.

[Tarkhein]

You seem to be making a few assumptions about dual-GPU cards. You still get heat and power consumption (minus a bit due to binning) and the bridge is built into the card rather than external (how else would you run SLI/Crossfire?). In return you get poorer overclocking. There's a reason why the unofficial ones are triple slot (they're binning for high clock frequency which means higher voltages which means heat).

[TechFan@ic]

It is actually in all probability going to be a dual 7950 card, since the FirePro S10000 which it's based on, is a dual 7950 card.

This is not confirmed yet, but I personally believe that it will be. It also makes since because of the thermal restrictions of a dual slot design.

[GTX590]

You seem to be making a few assumptions about dual-GPU cards. You still get heat and power consumption (minus a bit due to binning) and the bridge is built into the card rather than external (how else would you run SLI/Crossfire?). In return you get poorer overclocking. There's a reason why the unofficial ones are triple slot (they're binning for high clock frequency which means higher voltages which means heat).

1 card putting out 65*C is 1/2 the volume of 2 cards putting out an average of 65*C, so it will literally cut down the heat by half, generated inside my case. My case temp with 2 cards has gone up by 20*C, which has effected my CPU by 10*C as well. But the overclocking may not be quite a good, but neither is my vapor-x. @ TechFan@ic, the initial reviews show a 925/1350 clock with 2024 stream processors rather than the 1768 of an HD 7950, that leads me to think it will be dual HD 7970's.

[ShiverMePenguins]

It is actually in all probability going to be a dual 7950 card' date=' since the FirePro S10000 which it's based on, is a dual 7950 card. This is not confirmed yet, but I personally believe that it will be. It also makes since because of the thermal restrictions of a dual slot design.[/quote']

if its 2 7950's then i'd only consider it, if it were at most say, 550-600$ i would even pay 1k for 2 7970's. not when i can buy good 7970's in xfire for what... 700?

[Tarkhein]

1 card putting out 65*C is 1/2 the volume of 2 cards putting out an average of 65*C' date=' so it will literally cut down the heat by half, generated inside my case. My case temp with 2 cards has gone up by 20*C, which has effected my CPU by 10*C as well. But the overclocking may not be quite a good, but neither is my vapor-x. @ TechFan@ic, the initial reviews show a 925/1350 clock with 2024 stream processors rather than the 1768 of an HD 7950, that leads me to think it will be dual HD 7970's.[/quote']

You're forgetting that the majority of the heat is being output by the GPU, which you will still have two of with a dual-GPU card. All things being equal, a dual-GPU card will output the same amount of heat as two cards. As I said though, you'll get a slightly more efficient dual-GPU card due to stuff like binning, PCB modifications, etc.

[unidentical]

WHere did you get the stats that this is going to outgun a 690? Just curious.

[ShiverMePenguins]

WHere did you get the stats that this is going to outgun a 690? Just curious.

amd said so. and being that the 7970 ghz beats the 680 in many/most games it stands to reason.

[GTX590]

1 card putting out 65*C is 1/2 the volume of 2 cards putting out an average of 65*C' date=' so it will literally cut down the heat by half, generated inside my case. My case temp with 2 cards has gone up by 20*C, which has effected my CPU by 10*C as well. But the overclocking may not be quite a good, but neither is my vapor-x. @ TechFan@ic, the initial reviews show a 925/1350 clock with 2024 stream processors rather than the 1768 of an HD 7950, that leads me to think it will be dual HD 7970's.[/quote'] You're forgetting that the majority of the heat is being output by the GPU, which you will still have two of with a dual-GPU card. All things being equal, a dual-GPU card will output the same amount of heat as two cards. As I said though, you'll get a slightly more efficient dual-GPU card due to stuff like binning, PCB modifications, etc.

You're missing the point. It's still a single dual slot video card, the amount of air (or heated air) pushed out by the card into the case and out the back is the SAME as 1 of my HD 7950's. With 2 7950's I have DOUBLE the air displacement as a single card, there for DOUBLE the heat sources. Getting a single dual GPU card will reduce my room temps back to where I was with a single HD 7950. The HD 7990 is still 1 physical card itself with 2 Graphics chips. It still only has so much airflow it can push out the front of the card into the case and the rear of the card. THis amount will be pretty close to my HD 7950, clearly being a little more due to slightly more efficient airflow with the cooler design.

[GTX590]

WHere did you get the stats that this is going to outgun a 690? Just curious.

The "unofficial" HD 7990's made my powercolor and 1 other brand pretty much stomped the HD 690 and titan. I would assume the Radeon REAL release will be as powerful or slightly more.

[Tarkhein]

You're missing the point. It's still a single dual slot video card' date=' the amount of air (or heated air) pushed out by the card into the case and out the back is the SAME as 1 of my HD 7950's. With 2 7950's I have DOUBLE the air displacement as a single card, there for DOUBLE the heat sources. Getting a single dual GPU card will reduce my room temps back to where I was with a single HD 7950. The HD 7990 is still 1 physical card itself with 2 Graphics chips. It still only has so much airflow it can push out the front of the card into the case and the rear of the card. THis amount will be pretty close to my HD 7950, clearly being a little more due to slightly more efficient airflow with the cooler design. [/quote']

At this point I'm convinced you know nothing of physics or are trolling me. Two cards each outputting 200W of heat is going to be very similar to a single card outputting 400W of heat. Putting two GPUs into a single card doesn't magically reduce the heat output to that of a single-GPU card - EACH GPU outputs heat. More importantly that heat still has to go somewhere - out the case and into your room. Since the cooling doesn't use radial fans, this heat will rise and be used by your CPU heatsink as well. If you go the 7990 route, it will NOT go as you expect it will.

[GTX590]

You're missing the point. It's still a single dual slot video card' date=' the amount of air (or heated air) pushed out by the card into the case and out the back is the SAME as 1 of my HD 7950's. With 2 7950's I have DOUBLE the air displacement as a single card, there for DOUBLE the heat sources. Getting a single dual GPU card will reduce my room temps back to where I was with a single HD 7950. The HD 7990 is still 1 physical card itself with 2 Graphics chips. It still only has so much airflow it can push out the front of the card into the case and the rear of the card. THis amount will be pretty close to my HD 7950, clearly being a little more due to slightly more efficient airflow with the cooler design. [/quote'] At this point I'm convinced you know nothing of physics or are trolling me. Two cards each outputting 200W of heat is going to be very similar to a single card outputting 400W of heat. Putting two GPUs into a single card doesn't magically reduce the heat output to that of a single-GPU card - EACH GPU outputs heat. More importantly that heat still has to go somewhere - out the case and into your room. Since the cooling doesn't use radial fans, this heat will rise and be used by your CPU heatsink as well. If you go the 7990 route, it will NOT go as you expect it will.

You are wrong in soo many ways. First of all my Vapor-X has dual 8 pins and can consume up to 375W of power just like the HD 7990. It doesn't matter how much heat the cards generate per se. Each card exhausts the same amount of VOLUME of air. A dual card of similar dimensions and design of a single card will not magically be able to exhaust TWICE the volume of heat. My issue is VOLUME of heat exhausted not the heat produced. 2 cards exhaust TWICE the VOLUME of 1 card give or take 10% based on efficiency of the cooling system.

[rainbrodash666]

WHere did you get the stats that this is going to outgun a 690? Just curious.

The "unofficial" HD 7990's made my powercolor and 1 other brand pretty much stomped the HD 690 and titan. I would assume the Radeon REAL release will be as powerful or slightly more.

power color, asus, club 3d, and HIS have made unofficial 7990 cards.

[mvitkun]

if it raised your temps so much you must have pretty bad airflow.

[GTX590]

My card temps are amazing, 50/60*C, but my case has such good airflow it exhausts most of it into my room, raising my room temp to around 30*C.

[TechFan@ic]

My card temps are amazing' date=' 50/60*C, but my case has such good airflow it exhausts most of it into my room, raising my room temp to around 30*C.[/quote']

Yeah, the area where my PC is located, is significantly warmer than the rest of my room, can't do much about it though.

[GTX590]

So I am gonna pick up an HD 7990 over the summer probably, unless UPS refunds my 600 dollars they owe me for damaging a PC I sold. It should produce about the same heat as my HD 7950 in reference to total volume output.

[TechFan@ic]

Just out of curiosity GTX590, did you experience coil whine with any of your 7950s ? & did you experience coil whine with your power supply ?

I'm going to build a dual 7950 rig soon & I'm looking for coil-whine-free 7950s and power supplies.

Also how was your CrossfireX experience like ? did you enjoy it ?